package com.p2psys.tool;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.security.KeyStore;
import java.security.MessageDigest;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;

import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLException;
import javax.net.ssl.SSLSocket;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;
import javax.net.ssl.TrustManagerFactory;
import javax.net.ssl.X509TrustManager;
/**
 * 安装SSL证书工具类
 * 
 
 * @date 2012-9-7 下午2:45:10
 * @version
 *
 *  (c)</b> 2012-rongdu-<br/>
 *
 */
public class InstallCert {  
    public static void main(String[] args) throws Exception {  
        String host;  
        int port;  
        char[] passphrase;  
        if ((args.length == 1) || (args.length == 2)) {  
            String[] c = args[0].split(":");  
            host = c[0];  
            port = (c.length == 1) ? 443 : Integer.parseInt(c[1]);  
            String p = (args.length == 1) ? "changeit" : args[1];  
            passphrase = p.toCharArray();  
        } else {  
            //System.out.println("Usage: java InstallCert <host>[:port] [passphrase]");  
            return;  
        }  
  
        File file = new File("jssecacerts");  
        if (file.isFile() == false) {  
            char SEP = File.separatorChar;  
            File dir = new File(System.getProperty("java.home") + SEP + "lib" + SEP + "security");  
            file = new File(dir, "jssecacerts");  
            if (file.isFile() == false) {  
                file = new File(dir, "cacerts");  
            }  
        }  
          
        //System.out.println("Loading KeyStore " + file + "...");  
        InputStream in = new FileInputStream(file);  
        KeyStore ks = KeyStore.getInstance(KeyStore.getDefaultType());  
        ks.load(in, passphrase);  
        in.close();  
  
        SSLContext context = SSLContext.getInstance("TLS");  
        TrustManagerFactory tmf = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());  
        tmf.init(ks);  
        X509TrustManager defaultTrustManager = (X509TrustManager) tmf.getTrustManagers()[0];  
        SavingTrustManager tm = new SavingTrustManager(defaultTrustManager);  
        context.init(null, new TrustManager[]{tm}, null);  
        SSLSocketFactory factory = context.getSocketFactory();  
  
        //System.out.println("Opening connection to " + host + ":" + port + "...");  
        SSLSocket socket = (SSLSocket) factory.createSocket(host, port);  
        socket.setSoTimeout(10000);  
        try {  
            //System.out.println("Starting SSL handshake...");  
            socket.startHandshake();  
            socket.close();  
            //System.out.println();  
            //System.out.println("No errors, certificate is already trusted");  
        } catch (SSLException e) {  
            //System.out.println();  
            e.printStackTrace(System.out);  
        }  
  
        X509Certificate[] chain = tm.chain;  
        if (chain == null) {  
            //System.out.println("Could not obtain server certificate chain");  
            return;  
        }  
  
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));  
  
        //System.out.println();  
        //System.out.println("Server sent " + chain.length + " certificate(s):");  
        //System.out.println();  
        MessageDigest sha1 = MessageDigest.getInstance("SHA1");  
        MessageDigest md5 = MessageDigest.getInstance("MD5");  
        for (int i = 0; i < chain.length; i++) {  
            X509Certificate cert = chain[i];  
            //System.out.println(" " + (i + 1) + " Subject " + cert.getSubjectDN());  
            //System.out.println("   Issuer  " + cert.getIssuerDN());  
            sha1.update(cert.getEncoded());  
            //System.out.println("   sha1    " + toHexString(sha1.digest()));  
            md5.update(cert.getEncoded());  
            //System.out.println("   md5     " + toHexString(md5.digest()));  
            //System.out.println();  
        }  
  
        //System.out.println("Enter certificate to add to trusted keystore or 'q' to quit: [1]");  
        String line = reader.readLine().trim();  
        int k;  
        try {  
            k = (line.length() == 0) ? 0 : Integer.parseInt(line) - 1;  
        } catch (NumberFormatException e) {  
            //System.out.println("KeyStore not changed");  
            return;  
        }  
  
        X509Certificate cert = chain[k];  
        String alias = host + "-" + (k + 1);  
        ks.setCertificateEntry(alias, cert);  
  
        OutputStream out = new FileOutputStream("jssecacerts");  
        ks.store(out, passphrase);  
        out.close();  
  
        //System.out.println();  
        //System.out.println(cert);  
        //System.out.println();  
        //System.out.println("Added certificate to keystore 'jssecacerts' using alias '" + alias + "'");  
    }  
  
      
    private static final char[] HEXDIGITS = "0123456789abcdef".toCharArray();  
  
      
    private static String toHexString(byte[] bytes) {  
        StringBuilder sb = new StringBuilder(bytes.length * 3);  
        for (int b : bytes) {  
            b &= 0xff;  
            sb.append(HEXDIGITS[b >> 4]);  
            sb.append(HEXDIGITS[b & 15]);  
            sb.append(' ');  
        }  
        return sb.toString();  
    }  
  
      
    private static class SavingTrustManager implements X509TrustManager {  
        private final X509TrustManager tm;  
        private X509Certificate[] chain;  
  
        SavingTrustManager(X509TrustManager tm) {  
            this.tm = tm;  
        }  
  
        public X509Certificate[] getAcceptedIssuers() {  
            throw new UnsupportedOperationException();  
        }  
  
        public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {  
            throw new UnsupportedOperationException();  
        }  
  
        public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {  
            this.chain = chain;  
            tm.checkServerTrusted(chain, authType);  
        }  
    }  
}  